耐张塔输电线路等值覆冰厚度计算模型在不均匀覆冰下有效性分析  

Analysis on Validity of Equivalent Ice Thickness Calculation Model of Transmission Lines of Tension Tower Under Uneven Icing

作　　者：王俊锞 魏发生[1,3] 黄增浩 赵林杰 黄欢 文屹[2,3] WANG Junke;WEI Fasheng;HUANG Zenghao;ZHAO Linjie;HUANG Huan;WEN Yi(CSG Electric Power Research Institute Co.,Ltd.,Guangzhou,Guangdong 510663,China;Electric Power Research Institute of Guizhou Power Grid Co.,Ltd.,Guiyang,Guizhou 550002,China;Key Laboratory of Ice Prevention&Disaster Reducing of China Southern Power Grid Co.,Ltd.,Guiyang,Guizhou 550002,China)

机构地区：[1]南方电网科学研究院有限责任公司,广东广州510663 [2]贵州电网有限责任公司电力科学研究院,贵州贵阳550002 [3]中国南方电网有限责任公司防冰减灾重点实验室,贵州贵阳550002

出　　处：《广东电力》2021年第9期98-104,共7页Guangdong Electric Power

基　　金：中国南方电网有限责任公司防冰减灾重点实验室支撑项目(GZKJXM20191287)。

摘　　要：受山区地形影响,输电线路可能存在大高差、大档差等特殊工况。为了分析输电线路覆冰在线监测系统中,耐张塔输电线路等值覆冰厚度计算模型在一些特殊工况下的准确性,采用有限元法建立多档距输电线路仿真模型,研究大档差大高差、大档差无高差、非大档差大高差以及非大档差无高差等工况下的输电线路等值覆冰厚度计算结果的准确性。对于大档差工况,当输电线路前后档距电线覆冰不均匀程度较小时,计算结果与平均等值覆冰厚度的相对误差较小;反之,计算结果与平均等值覆冰厚度的相对误差较大(如当小档距侧输电线覆冰厚度为30 mm,大档距侧输电线覆冰厚度为10 mm,计算结果与平均等值覆冰厚度的相对误差大于40%);对于非大档差工况,计算结果与平均等值覆冰厚度的相对误差在30%以内,对于非大档差无高差输电线路,计算结果与平均等值覆冰厚度的相对误差在20%以内。结果表明,不均匀覆冰下,大档差与否对等值覆冰厚度计算结果的准确性有直接影响。Affected by the mountainous terrain,there are extreme conditions on the transmission lines such as large height and span length differences.In order to analyze the accuracy of the equivalent icing thickness calculation model of the tension tower in some extreme conditions,this paper adopts the finite element method to establish the simulation model of multi-span transmission lines,and studies accuracy of the calculation results of icing thickness on the transmission lines with large span length and height differences,large span length differences while no height differences,non-large span length differences and large height differences,non-large span length differences and no height differences.The result shows that under uneven icing condition,the large span length difference or not has a direct impact on the accuracy of the calculation results.For the condition of large span length differences,when the uneven degree of icing is small,the relative error between the calculation result and the average equivalent icing thickness is small,on the contrary,the relative error is large.For example,if the ice thickness on the transmission lines at the small pitch side is 30 mm,and the ice thickness at the large pitch side is 10 mm,the relative error between the calculation result and the average equivalent icing thickness is greater than 40%.For the condition of non-large span length differences,the relative error is less than 30%,and for the transmission lines of non-large span length differences without height difference,the relative error is within 20%.

关 键 词：输电线路 覆冰 在线监测 耐张塔 特殊工况 有限元法 

分 类 号：TM753[电气工程—电力系统及自动化] TB115[理学—数学]